Partners' Capital of the Operating Partnership - Additional Information (Details) - shares	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Stockholders' Equity
Common stock shares excluded from the diluted shares outstanding (in shares)	7,375,635	6,262,427
Series I Preferred Units
Stockholders' Equity
Preferred stock, shares outstanding (in shares)	9,200,000		9,200,000
SL Green Operating Partnership
Stockholders' Equity
Shares, issued (in shares)	71,123,984
Units outstanding (units)	71,123,984
Number of units of operating partnership owned by the noncontrolling interest unit holders (units)	5,878,318		4,877,891
Common stock shares excluded from the diluted shares outstanding (in shares)	2,395,646	2,159,695
SL Green Operating Partnership | Operating Partnership
Stockholders' Equity
Noncontrolling interest in the operating partnership (as a percent)	7.63%		6.42%
SL Green Operating Partnership | Series I Preferred Units
Stockholders' Equity
Period of restriction to redeem OP Units	1 year
Conversion of stock, shares issued	1